Value of 16-slice spiral CT in lower extremity arterial occlusive diseases

Objective:To explore the diagnostic value of 16-slice spiral CT in assessing the lower extremity arterial occlusive diseases.Methods: Thirty patients with suspected peripheral arterial occlusive diseases underwent 16-slice spiral CT angiography(CTA).The coverage was from renal artery to ankle.We used HP xw8000 workstation for 3D image process.All these patients also underwent digital subtraction angiography(DSA) two weeks before or after CTA.Using the results of DSA as the standard,the diagnostic accuracy of CTA was evaluated.Results: Of the 882 segments,870 were assessable on both DSA and CTA.On DSA images,260 segments were involved(32 mild stenosis,24 moderate stenosis,44 severe stenosis and 160 occlusion).With regard to segments that had more than moderate stenosis,the sensitivity,specificity and accuracy of MIP were 99.1%,99.7%,99.5%.Conclusion: 16-slice spiral CT is high sensitivity,specificity,and accuracy in detecting lower extremity arterial occlusive diseases and may partially substitute DSA examinations.